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  #61  
Old 04-19-2013, 08:23 AM
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Very Kewl

If you were local I would roll in... When I was ready for run up and break in.
Really appreciate the relevant information on the exhaust systems.
Thorley would ne interesting especially since there pretty much all that are left
Other than custom built tubes

Set of Thorley's available in classifieds
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Last edited by badaboom : 04-19-2013 at 09:06 AM.
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  #62  
Old 04-19-2013, 09:48 AM
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If someone would to send me a pair for a trial I would be happy to do so.
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  #63  
Old 04-30-2013, 05:47 PM
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Any opinions with the log manifold (post 80) drivers side. To the pre 80 as far as flow
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  #64  
Old 05-01-2013, 10:39 AM
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I am actually going try to run a test on that tonight. I will be comparing ported Free Flows to the stock post '80 manifolds.

BTW. With the ported Free Flows it made 292HP and 370#/ft of torque.
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  #65  
Old 06-04-2013, 05:11 AM
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pipefactory pipefactory is offline
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Quote:
Originally Posted by SC/397
I am actually going try to run a test on that tonight. I will be comparing ported Free Flows to the stock post '80 manifolds.

BTW. With the ported Free Flows it made 292HP and 370#/ft of torque.
Hey, do you have the results of the post 80's manifolds. I have my rebuilt 360 in my RV with Edelbrock shorty's I cut flanges and welded 3" mandrel bent tube to. I am thinking of going to stock manifolds to quiet her down a little and maybe pick up some bottom end torque. The most RPM's it ever see's is 4000 and that's rare. I cruise at 2500 at 60.
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  #66  
Old 06-04-2013, 07:10 PM
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Quote:
Originally Posted by pipefactory
I am thinking of going to stock manifolds to...maybe pick up some bottom end torque.
Hold up there. Restriction does not make torque. The old myth that backpressure builds torque is a gross perversion of the fact that exhaust pulse velocity usually increases power, and exhaust velocity is better at low engine speeds when header tubes are not too large.

If backpressure made power, we would all be stuffing potatoes into the exhaust system.

Long story short, stay with your headers!
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  #67  
Old 06-04-2013, 08:56 PM
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^^^ I like this guy! Spot on.
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  #68  
Old 06-04-2013, 11:43 PM
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Quote:
Originally Posted by Ghinmi
^^^ I like this guy! Spot on.
Heh, thanks. Exhaust tuning is a complicated, complicated issue, and I cannot pretend to know it all, but I have studied on it a fair bit. And I still remember watching a neighbor fighting the unbridled tire-burning torque of his Dodge D50 after we discretely enhanced it with one of Idaho's finest. Took him all of Saturday morning and most of the afternoon to tame that beast, as I recall. Ah, misspent youth...
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  #69  
Old 06-05-2013, 01:50 AM
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Hooker super comp will be the far best header you can get IMO surpassing even Hedman by far, however I'm not sure if they are made for AMC applications.
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  #70  
Old 05-12-2014, 11:09 AM
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Tinkerjeep Tinkerjeep is offline
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Update. My old Hedman's were 1.75" runners.

I just bought some new ones. They are the same, but do have the ball/socket collectors. I have re-ported and cleaned up the rough, uneven port welds and the ports are still smaller than the cyl-head ports.

The bench-grinding they did to level the port-welds to fit to the cyl/head...it was terrible. I had to re-do that.

At least the new gaskets are cool. They are a sandwich-type and might actually work longer. I did reshape the toe of the "moon-boot" which the port looks more like than a "dog-leg".

Link to my "Hedman hedder" topic shows some of the before and after... http://www.ifsja.org/forums/vb/showthread.php?t=170197

If you are looking at running Hedmans...I have about 8 hours of refurb to fix my ports and then strip the shipping paint off then repainting them with high temp paint.

They flow good, but maybe your money is better spent on better quality long-tub headers? I think if you have the tools and patience and a gentle hand/skilled eye...save some money, buy the cheapie Hedman's and fix the minor bungles yourself.

The HP/TQ is proven over stock manifolds.

Last edited by Tinkerjeep : 05-14-2014 at 08:42 PM.
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  #71  
Old 05-13-2014, 06:35 AM
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81cherokee laredo 81cherokee laredo is offline
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And here I was planning to get rid of my Headmans and go back with a stock style exhaust.. I guess I'll have to rethink this one.
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  #72  
Old 06-26-2014, 10:12 AM
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I DID upload a single pic showing the stock manifold being ported and not, side by side:

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  #73  
Old 06-26-2014, 09:00 PM
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Pretty funny, that last picture is the same as the first one posted in the thread. Someday I would like to make a a A vs B dyno pull to learn the difference between ported exhaust manifolds and non-ported one on a mild street engine.
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  #74  
Old 06-26-2014, 11:55 PM
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That would be interesting. I always though the steps would kill flow...but maybe its not as much as I think it is.

I did my "porting" job in September 2004, IIRC. That's when my blue J20 was getting roadworthy and I had to take the cracked Thorley's off. Here's the 1979 Blue J20 after it was road worthy...



Just recently repaired /modded those old Thorleys...
Here's the cross-bar/extended head flange inserts I made and welded on...







... and I finished a full length dual 2.5" exhaust system ( too many pics to post all of them here) but here's the crossover...



...mounted on the same truck but with different motor, tranny, T-case, bed, outer front clip, frame length, and axles...so not really the same truck except for the VIN.
The blue 1979 J20 truck before getting tires and a green paintjob....


Last edited by Tinkerjeep : 06-27-2014 at 12:10 AM.
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  #75  
Old 06-28-2014, 04:50 PM
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I made the mistake of buying a set of hooker headers. They are not the proper dog leg port. I had to do a lot of grinding and welding, but I ended up making them dogleg. It doesnt look pretty on the outside, but better matched the head on the inside.
I will try and upload some pics tomorrow if I can remember.
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  #76  
Old 06-29-2014, 10:15 AM
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go look at any of the dogleg headers,and see how great they match the profile on the heads. awful to say the least.

at least the hookers match the full square of the port. does stink they didn't go dogleg on theirs.
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  #77  
Old 06-30-2014, 05:43 PM
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They didnt match that great either. Only saving grace was I got these off ebay as "scratch and dent" for like 80-something dollars. If I had paid full retail price, I probably would have sent them back.
For some reason I cant get the pics to upload. I will try again tomorrow.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
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  #78  
Old 06-30-2014, 08:21 PM
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I'm starting to wonder whether I should develop some better header flanges. I already have some for other engines, and have been working on designs that would allow reasonable tubing sizes (maybe 1 5/8" OD) and still work with dogleg ports. Think there's a big enough market to make it worth pursuing?
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Did you know? Willys is just Willis spelled differently, but pronounced the same. Neither Willy nor his apostrophe are involved.
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  #79  
Old 06-30-2014, 10:57 PM
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http://www.bulltear.com/catalog/prod...b69cdf78c26ba5

Matt does a pretty good job.. didn't know if you had seen these.
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  #80  
Old 07-01-2014, 12:34 AM
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Quote:
Originally Posted by j2sax
http://www.bulltear.com/catalog/prod...b69cdf78c26ba5

Matt does a pretty good job.. didn't know if you had seen these.
Yessir, sure have. By my math, a flange that follows the stock port shape will accept about a 1 3/4" OD tube (reshaped to fit, of course) inside the opening. That's a fairly big primary tube for a medium displacement, low-RPM engine.

Just thinking out loud, that's all.
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High quality junk here: intro thread and slow build thread

Did you know? Willys is just Willis spelled differently, but pronounced the same. Neither Willy nor his apostrophe are involved.
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